Epimerization of glucose over ionic liquid/phosphomolybdate hybrids: structure–activity relationship
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C3 Epimerization of Glucose, via Regioselective Oxidation and Reduction.
Palladium-catalyzed oxidation can single out the secondary hydroxyl group at C3 in glucose, circumventing the more readily accessible hydroxyl at C6 and the more reactive anomeric hydroxyl. Oxidation followed by reduction results in either allose or allitol, each a rare sugar that is important in biotechnology. Also, N-acetylglucosamine is selectively oxidized at C3. These results demonstrate t...
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Tinelli, Regina (Washington University School of Medicine, St. Louis, Mo.), A. M. Michelson, and Jack L. Strominger. Epimerization of thymidine diphosphate glucose in bacterial extracts. J. Bacteriol. 86:246-251. 1963.-Extracts of Pasteurella pseudotuberculosis type IV and several other bacteria catalyzed the reversible interconversion of thymidine diphosphate (TDP)-d-glucose and TDP-d-galactos...
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Dirithromycin (3) isomerizes upon dissolution in different solvents. From X-ray analysis of V-T 108, an analogue of dirithromycin, and comparative 1H and 13C NMR, and MS data, the isomer of dirithromycin was confirmed to be the C-16-(S)-epimer. The ratio of the two epimers at equilibrium conditions was approximately 8:2 (R/S) in methanol at room temperature.
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In recent reports (I ) the term racemization is used inappropriately. It is stated in both reports that Lisoleucine racemizes to D-alloisoleucine. This reaction is epimerization, not racemization. Racemization of L-iSOleucine results in the formation of DLisoleucine. As stated in Eliel (2): "'racemization is the process of producing a racemic modification starting with one of the pure enantiome...
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ژورنال
عنوان ژورنال: Green Chemistry
سال: 2018
ISSN: 1463-9262,1463-9270
DOI: 10.1039/c7gc03738d